Bring the tomatillos, garlic cloves, and water to a boil in a small saucepan over high heat. Reduce heat to medium-low, and simmer until the tomatillos have lost their shape, 15 to 20 minutes.,Preheat the oven's broiler and set the oven rack at about 6 inches from the heat source. Line a baking sheet with aluminum foil. Cut the serrano peppers and poblano peppers in half from top to bottom; remove the stem, seeds, and ribs, then place the peppers cut-side-down onto the prepared baking sheet.,Cook under the preheated broiler until about 3/4 of the skin has blackened and blistered, 3 to 5 minutes. Place the blackened peppers into a bowl, and tightly seal with plastic wrap. Allow the peppers to steam for 5 to 7 minutes. Remove and discard the blackened skins. Stir the peppers into the simmering tomatillos; cook 5 minutes more.,______,Once cool, stir in the salt, cilantro, red onion, and lime juice to serve.